[Jdub]

I would approach this holistically - have you adjusted the clutch cable at the trans? How about the shift coupler - did they get to all four bushes (coupler x2; shaft bush; shift end cup bush) replaced when they went with the short shift kit?

When JohnW rebuild my trans. I had already repaired the pedal cluster, replaced the clutch cable and (sadly) the horseshoe spring. As the new clutch was breaking in, went in to check and adjust the clutch clearance (just once - held the setting).

So go around the entire trans - consider the bits that help the 915 shift better. I would also drop the trans fluid, have a look at your magnetic plugs just to have peace of mind and fresh fluids.